Investigation of the mixed-symmetric one-quadrupole phonon 2+ 1,ms state of the heavy nucleus 204Hg

21st International School on Nuclear Physics and Applications & International Symposium on Exotic Nuclei

Stegmann, R.^1 ; Stahl, C.^1 ; Rainovski, G.^2 ; Pietralla, N.^1 ; Möller, T.^1 ; Lettmann, M.^1 ; Janssens, R.V.F.^3 ; Carpenter, M.^3 ; Zhu, S.^3

Institut für Kernphysik, TU Darmstadt, Schlossgartenstrasse 9, Darmstadt

64289, Germany^1

Faculty of Physics, University of Sofia St. Kliment Ohridski, 5 James Bourchier Blvd., Sofia

1164, Bulgaria^2

Argonne National Laboratory, 9700 S. Cass Avenue, Argonne

IL

60439, United States^3

关键词: Argonne National Laboratory;    Collective excitations;    Coulomb excitation;    Heavy nucleus;    Low-energy;    Quadrupoles;    Stable nuclei;    Strength distribution;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/724/1/012047/pdf
DOI  :  10.1088/1742-6596/724/1/012047

来源: IOP

【 摘 要 】

Low-energy quadrupole-collective excitations of isovector character, the so-called states with proton-neutron mixed-symmetric character (MSS), have been investigated in204Hg which is the sole stable nucleus in the straight vicinity of208Pb exhibiting a 2π - 2ν structure. A12C(204Hg,204Hg∗)12C projectile Coulomb-excitation experiment at 890MeV was performed at Argonne National Laboratory using the ATLAS accelerator. γ-rays originating from the decay of the excited states of204Hg were detected using the GAMMASPHERE spectrometer. The measured Coulomb-excitation yields provide the B(M1) and the B(E2) strength distributions which unambiguously reveal the 23+state at 1948 keV as the one-phonon MSS of204Hg.